package com.sangdaelee.example.kakaoproject;

import java.util.ArrayList;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabWidget;


public class TabsAdapter extends FragmentPagerAdapter implements
TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final TabHost mTabHost;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

static final class TabInfo {
private final String tag;
private final Class<?> clss;
private final Bundle args;

TabInfo(String _tag, Class<?> _class, Bundle _args) {
	tag = _tag;
	clss = _class;
	args = _args;
}
}

static class DummyTabFactory implements TabHost.TabContentFactory {
private final Context mContext;

public DummyTabFactory(Context context) {
	mContext = context;
}

@Override
public View createTabContent(String tag) {
	View v = new View(mContext);
	v.setMinimumWidth(0);
	v.setMinimumHeight(0);
	return v;
}
}

public TabsAdapter(FragmentActivity activity, TabHost tabHost,
	ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mTabHost = tabHost;
mViewPager = pager;
mTabHost.setOnTabChangedListener(this);
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}

public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
tabSpec.setContent(new DummyTabFactory(mContext));
String tag = tabSpec.getTag();

TabInfo info = new TabInfo(tag, clss, args);
mTabs.add(info);
mTabHost.addTab(tabSpec);
notifyDataSetChanged();
}

@Override
public int getCount() {
return mTabs.size();
}

@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(), info.args);
}

@Override
public void onTabChanged(String tabId) {
int position = mTabHost.getCurrentTab();
mViewPager.setCurrentItem(position);
}

@Override
public void onPageScrolled(int position, float positionOffset,
	int positionOffsetPixels) {
}

@Override
public void onPageSelected(int position) {
// Unfortunately when TabHost changes the current tab, it kindly
// also takes care of putting focus on it when not in touch mode.
// The jerk.
// This hack tries to prevent this from pulling focus out of our
// ViewPager.
TabWidget widget = mTabHost.getTabWidget();
int oldFocusability = widget.getDescendantFocusability();
widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
mTabHost.setCurrentTab(position);
widget.setDescendantFocusability(oldFocusability);
}

@Override
public void onPageScrollStateChanged(int state) {
}
}